[Paraview] RequestData Being Called Multiple Times [PV3.1.0]

[Mike Jackson]

For those playing along at home I recompiled ParaView 2.6 and the  
reader's RequestData gets fired at least 4 times there. So I am just  
generally not doing something correct with this reader.

There are time steps involved, is that a problem?


I use things like
   vtkSetStringMacro(ActivePhase);
   vtkGetStringMacro(ActivePhase);

and then during RequestInformation I will call SetActivePhase(...),  
will that cause the pipeline to update?

-- 
Mike Jackson   Senior Research Engineer
Innovative Management & Technology Services


On Jul 17, 2007, at 12:58 PM, Moreland, Kenneth wrote:

> Another thought.  Are you calling Modified (either directly or
> indirectly) in RequestData?  If the modified flag gets called, VTK  
> will
> assume that the data is out of date and run RequestData again whenever
> possible.  Check the value of the MTime ivar at the beginning and the
> end of RequestData.  It should be the same.
>
> -Ken
>
>> -----Original Message-----
>> From: paraview-bounces+kmorel=sandia.gov at paraview.org
> [mailto:paraview-
>> bounces+kmorel=sandia.gov at paraview.org] On Behalf Of Mike Jackson
>> Sent: Tuesday, July 17, 2007 10:45 AM
>> To: eschenbe at psc.edu
>> Cc: ParaView
>> Subject: Re: [Paraview] RequestData Being Called Multiple Times
> [PV3.1.0]
>>
>> I finally got a debugger working and setting a breakpoint at the top
>> of RequestData is interesting to say the least. The stack is anywhere
>> from 69 to 72 deep at that point. Copying the stack from each time
>> the break point is hit and pasting into text files, the running a
>> diff against two of the files shows the the differences are about the
>> 39 to 42 depth. All this is way beyond me at this point. I can send
>> the stack traces if anyone wants to look through them.. ;-)
>>
>> 	Maybe I will try and compile this against 2.6.x and see if the
>> problem persists. I have written another reader that inherits from
>> PolyDataAlgorithm and I don't have this sort of trouble. I am sure it
>> is something stupid that I am doing. I am looking at the ImageReader2
>> class to get an idea of what I _should_ be doing at this point.
>>
>>
>> --
>> Mike Jackson   Senior Research Engineer
>> Innovative Management & Technology Services
>>
>>
>> On Jul 17, 2007, at 12:21 PM, Kent Eschenberg wrote:
>>
>>> Mike Jackson wrote:
>>>> That does not seem to be it.. Although good idea. Any other
>>> thoughts?
>>>
>>>> On Jul 17, 2007, at 11:59 AM, Kent Eschenberg wrote:
>>>>> I've seen that when RequestData returns a value that signals an
>>> error.
>>>
>>> Only a crude shot in the dark: set a breakpoint at the start of
>>> RequestData and see if the traceback suggests why the call was
>>> made. I've written several readers for 2.6.1 and haven't seen the
>>> problem you report except when the reader's return value indicated
>>> an error.
>>>
>>> Kent
>>> Pittsburgh Supercomputing Center
>>
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